Lesson 13

Día 2 de centros (optional)

Warm-up: Verdadero o falso: ¿Verdaderos o fal... dos? (10 minutes)


The purpose of this True or False is to elicit strategies and understandings students have for adding with multiples of 2 and 2 equal addends. These understandings help students deepen their understanding of the properties of operations, fluency within 20, and will be helpful practice as students develop foundations for multiplication.


  • Display one statement.
  • “Hagan una señal cuando sepan si la afirmación es verdadera o no, y puedan explicar cómo lo saben” // “Give me a signal when you know whether the statement is true and can explain how you know.”
  • 1 minute: quiet think time


  • Share and record answers and strategy.
  • Repeat with each statement.

Student Facing

Decide si cada afirmación es verdadera o falsa. Prepárate para explicar tu razonamiento.

  • \(2 + 2 + 2 + 2 = 4 + 4\)
  • \(2 + 2 + 2 = 3 + 3\)
  • \(2 + 2 + 2 + 2 + 2 + 2 = 5 + 5\)

Student Response

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Activity Synthesis

  • “¿Cómo pueden explicar su respuesta sin encontrar el valor de ambos lados?” // “How can you explain your answer without finding the value of both sides?”

Activity 1: Centros: Momento de escoger (40 minutes)


The purpose of this activity is for students to have another chance to practice skip-counting by 2, 5, and 10 and addition and subtraction within 1,000.

Required Materials

Materials to Gather

Required Preparation

Gather materials from:

  • Write Numbers, Stage 4
  • Target Numbers, Stages 6 and 7
  • Five in a Row, Stages 7 and 8
  • How Close, Stage 4


  • “Ahora van a escoger centros de los que ya conocemos” // “Now you will choose from centers we have already learned.”
  • Display the center choices in the student book.
  • “Piensen qué les gustaría hacer primero” // “Think about what you would like to do first.”
  • 30 seconds: quiet think time


  • Invite students to work at the center of their choice. 
  • 1520 minutes: center work time
  • “Escojan qué les gustaría hacer ahora” // “Choose what you would like to do next.”
  • 1520 minutes: center work time
  • If time allows, have students choose a third center to work on.

Student Facing

Escoge un centro.

Escribe números

Center activity. Write Numbers.

Números objetivo

Center activity. Target Numbers.

Cinco en línea

Center activity. Five in a row.

¿Qué tan cerca?

Center activity. How Close.

Activity Synthesis

  • Invite 2-3 students to share their favorite method for adding and subtracting within 1,000. 

Lesson Synthesis

Lesson Synthesis

“Este año hemos aprendido mucho sobre la suma y la resta. ¿Cuáles son algunas cosas importantes que debemos recordar sobre la suma y la resta?” // “We have learned a lot about addition and subtraction this year. What are some important things we need to remember about addition and subtraction?” 

Share and record responses. 

“¿Qué preguntas tienen sobre la suma y la resta?” // “What questions do you have about addition and subtraction?”